JP2004016846A - Nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To widen the jetting angle of a nozzle, which has a wide jetting angle in the width direction, also in the thickness direction perpendicular to the width direction. <P>SOLUTION: A flow channel is formed from a flow inlet at one end toward the jetting side at the other end along the center axial line of a nozzle main body and the tip end of the flow channel in the jetting side is made to be an arc-like main hole. On the other hand, a slit in the diameter direction is formed in the flat face of the tip end of the nozzle main body in the jetting side and the slit is made slanting in the depth direction toward the center from both ends in the longitudinal direction and the center part of the slit is communicated with the tip end of the main hole so as to form a main jetting hole with long width. Further, a deflector parallel to the slit direction is installed in the base part of the main hole in such a manner that the deflector transversely crosses a flow channel on the opposite to the main jetting hole, so that a fluid flowing in from the flow inlet side comes into collision against the deflector and is divided in the thickness direction perpendicular to the width direction of the main jetting hole and thus the jetting angle in the thickness direction is widened. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a nozzle, and more specifically, to spray two fluids of gas-liquid mixture consisting of water and air in a thick width, and to apply cooling water to a slab continuously drawn out to a secondary cooling zone of a continuous casting apparatus. It is preferably used for spraying.
[0002]
Conventionally, in the secondary cooling zone of continuous casting equipment, multiple nozzles are juxtaposed at intervals between rolls that are juxtaposed, the spray area is wrapped, cooling mist is sprayed on the entire slab, and uncooled parts are generated And eliminates cooling unevenness.
[0003]
As a nozzle for cooling a slab of this type, the present applicant has previously provided a two-fluid nozzle shown in FIG. 12 in Japanese Patent Application Laid-Open No. 5-329402.
The nozzle 1 has a main hole 2 having an arc-shaped tip of a gas-liquid mixing channel along the center axis of the nozzle body 1, sub holes 3 provided on both sides thereof, and a diametrical direction provided on the top surface of the injection side. An injection hole 5 is provided so that the cut 4 communicates with the main hole 2 and the sub hole 3.
[0004]
[Problems to be solved by the invention]
In the above-mentioned nozzle, the spray pattern has a trapezoidal shape in which the sewn-pulling portions on both sides are short, and the flow rate, the impact force, and the particle diameter of the wrapped portion and the non-wrapped portion are equalized. In addition, even if the turndown ratio of the flow control range is changed to a wide range of 1:20 or more, there is an advantage that the fluctuation of the flow rate, hitting force, and particle diameter between the wrapped portion and the non-wrapped portion can be suppressed. Things.
[0005]
In general, in a two-fluid nozzle, when the proportion of the air amount is increased, the spray range in the thickness direction is widened, while when the proportion of the air amount is decreased, the spray range is narrowed.
In the nozzle shown in FIG. 12, when the proportion of the air amount is reduced, the spray angle in the thickness direction Y orthogonal to the width direction X of the injection hole 5 tends to be narrow.
Recently, from the viewpoint of speeding up the cooling rate and energy saving, it has been demanded to reduce the amount of high-pressure air used, and even if the proportion of air in the two-fluid nozzle is reduced, the spray angle in the thickness direction can be reduced. The challenge is not to reduce it.
[0006]
[Means for Solving the Problems]
In order to solve the above problem, the present invention provides a flow path from the inflow port at one end to the injection side at the other end along the central axis of the nozzle body, and the tip of the injection side of the flow path has a circular arc shape. While the hole
A notch in the diameter direction is provided on the flat surface of the tip on the injection side of the nozzle body, and the notch is inclined in the depth direction from both ends in the length direction toward the center, and the center of the notch is the tip of the main hole. To provide a main injection hole with a long width,
And, at the base of the main hole, a deflector parallel to the cutting direction is attached so as to face the main injection hole and traverse the flow path,
A nozzle having a configuration in which a fluid flowing from the inlet side collides with the deflector to split the fluid in a thickness direction orthogonal to a width direction of the main injection hole, thereby increasing a spray angle in the thickness direction. Is provided.
[0007]
According to the above configuration, the deflector is installed at the base of the main hole, and the fluid collides with the deflector and is diverted in the thickness direction orthogonal to the width direction of the injection hole, and after the fluid is expanded in the thickness direction, Since the injection is performed from the injection hole, the injection angle in the thickness direction orthogonal to the width direction of the main injection hole can be widened.
Therefore, even if the ratio of the air amount of the two fluids of the gas-liquid mixture is reduced, by installing the deflector, the injection angle in the thickness direction is not reduced, and the ratio of the water amount is increased. The cooling effect can be enhanced.
[0008]
In the nozzle, sub-holes are formed so as to communicate with both sides of the main hole in a direction orthogonal to the cut direction of the top surface, and these sub-holes are opened on opposite side surfaces of the cut, and on both sides of the main injection hole. The sub injection holes are provided so as to communicate with each other.
When the sub-holes are provided on both sides of the main hole as described above, the sub-injection holes opened on both side surfaces of the cut communicate with both sides in the orthogonal direction at the central portion of the main injection hole term long in the width direction, so that the thickness is small. The spray angle in the direction can be broadened.
[0009]
Specifically, the injection-side tip of the nozzle body is reduced in diameter stepwise, the main hole is provided at the center of the injection side from the reduced diameter portion, and the sub-holes are provided on both sides thereof, and the stepped shape is provided. The deflector is disposed in the reduced diameter portion, and a sub hole is provided on the injection side of the deflector.
With the above configuration, the fluid diverted by the deflector flows into the sub-hole side, swells in the thickness direction, and can be ejected from the sub-injection hole through the sub-hole, so that the thickness of the spray in the thickness direction can be increased. It can be reliably expanded.
[0010]
The notch in the diametric direction has a constant dimension in the orthogonal direction, and the opposite side surfaces are inclined outwardly toward the opening at a required angle or perpendicular to the notch bottom surface, and the notch in the diametric direction. Are inclined linearly or arcuately toward the center.
[0011]
It is preferable that both sides of the cut are chamfered and inclined in a range of 10 ° to 30 °, preferably 14 ° to 15 °, but may be vertical.
Further, the cut may be made linearly at a tilt angle of 25 ° to 70 ° toward the center, or may be cut in an arc toward the center. In any case, the injection angle in the width direction from the main injection hole can be set to a wide angle along the shape of the cut.
[0012]
The deflector is formed in a substantially elongated plate shape, and both ends thereof are attached to the inner peripheral surface of the nozzle body, and are attached so as to be orthogonal to the central axis of the flow path. The deflector may be fixed to the nozzle body or may be detachably replaceable.
Specifically, arc-shaped mounting portions are provided on both sides of the elongated plate shape, and the arc-shaped mounting portions are closely fitted to the inner peripheral surface of the nozzle main body.
[0013]
The cross-sectional shape of the deflector is a thick rectangular shape, a trapezoidal or triangular cross-section having a smaller diameter toward the injection hole side, a trapezoidal or triangular cross-section having a larger diameter toward the injection hole side, and a circular cross-section. Alternatively, the shape may be elliptical. Alternatively, deflectors having different shapes may be prepared and selected and attached according to spray conditions.
[0014]
The deflector arranged in the diameter direction across the flow path has a dimension in a direction perpendicular to the diameter direction equal to or slightly larger than a thickness dimension of the main injection hole.
When the size of the deflector is made smaller than the thickness of the injection hole, the amount of inflow into the sub-hole decreases, the amount of spray from the sub-injection hole decreases, the amount of spray in the thickness direction decreases, and the spray angle becomes too wide. It is not possible. Therefore, it is preferable to make the deflector larger than the thickness dimension of the main injection hole, but if it is too large, the injection amount from the main injection hole decreases. Therefore, the size of the deflector is made smaller than the diameter of the main hole, and the fluid diverted by the deflector flows into both the main hole and the sub-hole, and is injected from both the main injection hole and the sub-injection hole in an appropriate balance. It is set to be.
[0015]
The sub-holes provided on both sides of the main hole extend the tip to substantially the same position as the tip of the main hole, and the tip of the sub-hole is arc-shaped, flat, or tapered toward the lower hole, or V-shaped, and
The tip of the sub-hole is parallel to or close to the tip of the pilot hole.
By changing the tip shape of the sub-hole as described above, the injection amount and the injection angle from the sub-injection hole can be arbitrarily set.
[0016]
The fluid path of the nozzle body is supplied with two fluids of gas and liquid mixture of liquid and air, and is sprayed as a cooling water jet for juxtaposed between rolls in a secondary cooling zone of a continuous casting apparatus, and continuously sprayed by the rolls. It is arranged so that the spray liquid is sprayed in a thick width over the entire surface of the cast slab drawn out.
[0017]
Since the nozzle of the present invention has a wide jetting angle in the width direction by jetting from the long main jetting hole, and by arranging the deflector, the jetting angle in the thickness direction in the orthogonal direction is also widened. Even if the ratio of the air amount is decreased, the injection angle in the thickness direction does not decrease, and the cooling rate can be increased by increasing the ratio of the water amount. Therefore, when the nozzles are arranged for cooling the slab, the ratio of the amount of air supplied to each nozzle can be reduced, energy can be saved, and the running cost can be significantly reduced. At the same time, the cooling rate can be increased.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, the nozzle body 10 has a base end of a flow path 11 formed along a central axis L as an inlet 12 for a gas-liquid mixture, and a stepped diameter at the tip of the inlet 12. A main hole 14 having an arc-shaped tip is provided at the injection-side tip of the stepped reduced diameter portion 13 and a pair of sub-holes 15 (15A, 15B) are provided on opposite sides thereof. I have.
[0019]
The sub-holes 15 provided on both sides of the main hole 14 have a circular cross section orthogonal to the central axis L, and the sub-holes 15 having a small circular cross section are connected to both sides of the main hole 14 having a large circular cross section. I have. Further, the tip 15a on the ejection side of the sub hole 15 is formed in an arc shape, and extends in parallel to substantially the same position as the tip on the ejection side of the main hole 14.
[0020]
A cut 16 in the diametric direction is provided in the flat surface 10a at the injection end of the nozzle body 10 with the same width, and the cut 16 is linearly inclined in the depth direction toward the center from both ends in the length direction. That is, the bottom surface 16a of the cut 16 is a tapered surface 16a, and both side surfaces 16b and 16c opposed in the width direction are slightly inclined in the outward opening direction toward the opening side.
[0021]
The notch 16 cuts the tip of the main hole 14 and the main hole side of the sub holes 15A and 15B, so that a main injection hole 18 having a long width direction X is formed on the bottom surface 16a of the notch 16, and both sides of the notch 16 are formed. A pair of sub-injection holes 19 in the thickness direction Y are formed at the center of the main injection hole 18 so as to communicate with the main injection hole 18 and open to the surfaces 16b and 16c.
[0022]
Inside the nozzle body 10, a deflector 20 is fitted and attached to the stepped reduced diameter portion corresponding to the base of the main hole 14 and the sub hole 15. The deflector 20 is disposed so as to cross the center of the flow path as a direction parallel to the width direction X of the main injection hole 18.
[0023]
The deflector 20 has a shape shown in FIG. 4 and has an elongated plate shape extending in the diameter direction of the flow path. At both ends thereof, mounting portions 20b each having an outer peripheral edge formed in an arc shape are protruded, and the outer peripheral edge of the attaching portion 20b is formed. Is mounted in contact with the inner peripheral surface of the flow path of the nozzle body.
The flow dividing plate portion 20a sandwiched between the mounting portions 20b on both sides has a thick rectangular shape, and divides the fluid along both side surfaces of the flow dividing plate portion 20a.
The width W1 of the flow dividing plate portion is larger than the dimension of the main injection hole 18 in the thickness direction Y and smaller than the diameter of the main hole 14, so that the fluid flowing from the inflow port collides with the deflector 20 so that the main injection is performed. The flow is diverted in the thickness direction Y of the hole 18, and the diverted fluid flows into the main hole 14 and the sub hole 15.
[0024]
In the nozzle having the above-described shape, the gas-liquid mixed fluid flowing into the flow path of the nozzle body 10 collides with the deflector 20, is divided into two, and flows into both sides of the main hole 14 and the sub holes 15A and 15B on both sides. . The diverted fluid that flows into both sides of the main hole 14 flows into the center of the main hole 16 and is ejected from the main injection hole 18 because the main hole 14 is collected in an arc shape. At this time, the main injection hole 18 is formed in a horizontally long shape extending in the width direction X, and the cut 16 opening in the main injection hole 18 is formed in a shape penetrating in the width direction X, so that the fuel is injected along the cut 16. The spray has a wide spray angle in the width direction X.
[0025]
Further, in the thickness direction Y orthogonal to the width direction X of the main injection hole 18, the sub injection holes 19A and 19B communicating with the opposing sub holes 15A and 15B communicate with and open to both sides of the central portion of the main injection hole 18. Since the spray in the thickness direction Y is performed from the sub injection holes 19A and 19B, the spray angle in the thickness direction can be widened.
[0026]
The nozzle is disposed between the rolls (not shown) of the secondary cooling zone of the continuous casting apparatus at intervals in the width direction X and the thickness direction Y, and the spray area corresponding to the width direction X of the main injection hole 18. Are wrapped, and both sides of the ejection range in the thickness direction Y are wrapped. Since the spray angle in the thickness direction Y of the spray is wider than that of the conventional nozzle, the nozzle 10 is a so-called thick-width nozzle.
As described above, since the deflector is arranged and divided and diverted in the thickness direction orthogonal to the width direction and then jetted, the jet can be jetted in a thick and wide structure. Even if the number is reduced, the jetting angle in the width direction is not reduced, the energy saving can be achieved by reducing the proportion of the air amount, and the cooling rate can be increased by increasing the proportion of the water amount.
[0027]
FIG. 5 shows a measurement result obtained by measuring a flow rate distribution in a thickness direction to obtain a spray angle using a nozzle of the present invention having a deflector and the conventional nozzle shown in FIG. 12 without a deflector. It is a graph shown.
The measurement conditions were as follows: the air amount was constant at 75 NL / min, the water amount was increased stepwise from 1 L / min → 5 L / min → 15 L / min, and the air ratio (air-water ratio) was decreased stepwise.
[0028]
As is clear from the graph shown in FIG. 5, when the mixing ratio of air is increased when the amount of water is 1 L / min, the conventional nozzle without a deflector has a jetting angle in the thickness direction of 39 ° and a deflector. In the nozzle of the present invention, the jetting angle was slightly wider at 37 ° without the deflector provided. On the other hand, when the amount of water was increased to 5 L / min to lower the mixing ratio of air, the injection angle in the thickness direction was reversed, and was 25 ° in the conventional nozzle and 32 ° in the present invention. Further, when the mixing ratio of air was further decreased by increasing the amount of water to 15 L / min, the angle was 18 ° for the conventional nozzle and 33 ° for the nozzle of the present invention.
From this result, in the nozzle of the present invention provided with the deflector, the spray angle in the thickness direction does not sharply decrease even if the ratio of the air amount is reduced, and the air amount is smaller than when the deflector is not provided. It was confirmed that the spray angle in the thickness direction could be kept substantially constant even when the decrease ratio was increased.
[0029]
Further, in the nozzle of the present invention provided with the deflector and the conventional nozzle not provided with the deflector, the flow rate distribution and the spray angle in the width direction orthogonal to the thickness direction are measured by measuring the injection angle in the thickness direction. Similarly, the measurement was performed with the air amount kept constant and the water amount increased stepwise. The results are shown in the graph of FIG.
[0030]
As shown in the graph of FIG. 6, the nozzle of the present invention was slightly wider than the conventional nozzle regardless of the increase or decrease in the mixing ratio of the air amount in the width direction. In addition, even in the lap portion where the spray ranges of the nozzles arranged adjacently interfere with each other, the flow rate distribution becomes the same as that of the unwrapped portion, and it can be confirmed that the flow rate distribution can be made uniform.
[0031]
FIGS. 7A to 7F show modified examples of the deflector 20.
In FIG. 7A, both ends 20b that are in contact with the inner circumferential surface of the nozzle body are not enlarged, and the outer circumferences of both ends are arc-shaped.
In the above-described embodiment, the cross section of the deflector 20 in the direction of the flow channel axis is rectangular. However, in FIG. 7B, the cross section is reduced in diameter toward the injection side, and in FIG. I have. FIG. 7 (D) is reversed from FIG. 7 (B), and FIG. 7 (E) is reversed from FIG. 7 (C). FIG. 7F shows an elliptical cross section.
The direction of the diverted fluid can be controlled by the cross-sectional shape of the deflector 20 shown in FIGS. 7B to 7F, and the spray angle in the thickness direction can be arbitrarily changed. Therefore, deflectors 20 having different cross-sectional shapes may be prepared, and selected and used according to the injection conditions.
[0032]
FIGS. 8A to 8C show modified examples of the distal end of the sub hole 15.
In FIG. 8A, the tip of the sub hole 15 has a flat shape. With such a flat shape, the sub-hole can be machined by the end mill.
In FIG. 8B, the tip of the sub hole 15 is V-shaped.
In FIG. 8C, the axis of the sub hole 15 is shifted toward the main hole 14 at the front end.
[0033]
9A and 9B, sub-holes 15A and 15B provided on both sides of the main hole 14 are formed as both side portions having an elliptical cross section which crosses the main hole 14.
In FIG. 10, two sub holes 15A-1, 15A-2 and 15B-1, 15B-2 are provided on both sides of the main hole 14, respectively.
Although not shown, a sub-hole may be provided only on one side of the main hole 14 depending on spray conditions.
[0034]
By changing the shape of the sub-hole as shown in FIGS. 8 to 10 above, the shape of the sub-injection hole that is opened by cutting the top surface of the nozzle body is changed, and the injection angle from the sub-injection hole and the spray The flow rate can be adjusted.
[0035]
FIG. 11 shows a modified example of the cut 16 in the diameter direction provided on the top surface of the nozzle body. In the above embodiment, the cut is made linearly inclined toward the center of the nozzle body. It is cut at an angle.
[0036]
In addition, the present invention is not limited to the above embodiment, and it is preferable to provide a sub hole, but it is not always necessary to provide a sub hole, and a deflector is provided and divided in a thickness direction, and then the liquid is injected from the main injection hole. Also in this case, the ejection angle in the thickness direction can be expanded as compared with the case where the deflector is not provided.
Further, the above-mentioned nozzle is preferably used as a two-fluid nozzle in which air and water are mixed, but the jetting angle in the thickness direction does not decrease even if the proportion of air is reduced, so that the proportion of air is reduced to zero. As a one-fluid nozzle using only water. In this case, the cooling effect can be further improved, and high-pressure air can be eliminated, so that the running cost can be significantly reduced.
Needless to say, it is not limited to cooling but can be used for various purposes.
[0037]
【The invention's effect】
As is clear from the above description, according to the nozzle of the present invention, a deflector is installed at the base of the main hole, and the fluid collides with the deflector and is diverted in the thickness direction orthogonal to the width direction of the main injection hole, Since the fuel is injected from the main injection hole after having been spread in the thickness direction, the injection angle in the thickness direction orthogonal to the width direction of the main injection hole can be increased. Therefore, even if the ratio of the air amount of the two fluids of the gas-liquid mixture is reduced, by attaching the deflector, the injection angle in the thickness direction is not reduced, and the ratio of the water amount is increased. The cooling effect can be enhanced.
[0038]
Furthermore, on the thickness direction side of the main injection hole, sub-holes are provided on both sides of the main hole, and the sub-injection holes communicating with the sub-holes are opened to communicate with both sides of the center of the main injection hole. Since a part of the fluid is ejected from the sub-injection hole through the sub-injection, the ejection angle in the thickness direction can be further widened.
[Brief description of the drawings]
1A and 1B show a nozzle according to an embodiment of the present invention, in which FIG. 1A is a side view of an injection side, and FIG. 1B is a side view of an opposite inlet side.
FIG. 2 is a perspective view of the nozzle.
3A is a sectional view taken along line AA of FIG. 1A, and FIG. 3B is a sectional view taken along line BB of FIG.
FIG. 4A is a perspective view of a deflector mounted in a nozzle body, and FIG. 4B is a cross-sectional view taken along line CC of FIG.
FIG. 5 is a graph showing the results of measuring the spray angle in the thickness direction of the nozzle equipped with the deflector of the present invention and the conventional nozzle without the deflector.
FIG. 6 is a graph showing the results of measuring the spray angle and the lap state in the width direction of the nozzle equipped with the deflector of the present invention and the conventional nozzle without the deflector.
FIGS. 7A to 7F are views showing modified examples of the deflector.
FIGS. 8A to 8C are views showing a modification of the tip shape of the sub-hole.
FIGS. 9A and 9B are diagrams showing another modified example of the sub hole.
FIG. 10 is a view showing another modification of the sub hole.
FIG. 11 is a cross-sectional view illustrating a modified example of the cut in the top surface of the nozzle body.
FIGS. 12A to 12C are views showing a conventional nozzle.
[Explanation of symbols]
Reference Signs List 10 Nozzle body 12 Inlet 13 Reduced diameter step 14 Main hole 15 (15A, 15B) Sub hole 15a Tip 16 Notch 16a Bottom surface 16b, 16c Side surface 18 Main injection hole 19 (19A, 19B) Sub injection hole 20 Deflector 20a Plate part 20b Mounting part X Width direction Y Thickness direction

Claims (7)

Along the center axis of the nozzle body, a flow path is provided from the inflow port at one end toward the injection side at the other end, while the injection side end of the flow path is an arc-shaped main hole,
A notch in the diameter direction is provided on the flat surface of the tip on the injection side of the nozzle body, and the notch is inclined in the depth direction from both ends in the length direction toward the center, and the center of the notch is the tip of the main hole. Provide a long main injection hole by communicating with
And, at the base of the main hole, a deflector parallel to the cutting direction is attached so as to face the main injection hole and traverse the flow path,
A nozzle having a configuration in which a fluid flowing from the inlet side collides with the deflector to split the fluid in a thickness direction orthogonal to a width direction of the main injection hole, thereby increasing a spray angle in the thickness direction. . Sub-holes are formed so as to communicate with both sides of the main hole in a direction orthogonal to the cutting direction, and these sub-holes are opened on opposite side surfaces of the cut, and sub-injection holes are communicated with both sides of the main injection hole. The nozzle according to claim 1, wherein the nozzle is provided. The injection-side tip of the nozzle body is stepwise reduced in diameter, the main hole is provided at the center of the injection side from the reduced diameter portion, and the sub-holes are provided on both sides thereof, and the stepped reduced diameter portion is provided. 3. The nozzle according to claim 2, wherein a deflector is arranged, and a sub-hole is provided on an ejection side of the deflector. The cut in the diameter direction, while keeping the dimension in the direction perpendicular to the cut direction constant, and inclining outwardly facing the opening side at a required angle or perpendicular to the cut bottom, and,
The nozzle according to any one of claims 1 to 3, wherein the cut in the diameter direction is inclined in a linear or arc shape toward the center. The deflector is formed in a substantially elongated plate shape, and its both ends are abutted on the inner peripheral surface of the nozzle body and are mounted orthogonal to the flow path central axis,
The cross-sectional shape in the axial direction of the deflector is a thick rectangular shape, a trapezoidal cross section or a triangular cross section having a smaller diameter toward the injection hole side, and a trapezoidal or triangular cross section having a larger diameter toward the injection hole side. The nozzle according to any one of claims 1 to 3, wherein the nozzle has a circular or elliptical cross section, and deflectors having different shapes are selected and attached according to spraying conditions. The sub-holes provided on both sides of the main hole extend the tip to substantially the same position as the tip of the main hole, and the tip of the sub-hole is arc-shaped, flat, or tapered toward the lower hole, or V-shaped, and
The nozzle according to any one of claims 2 to 5, wherein a tip of the sub-hole is parallel to or close to a tip of the pilot hole. Two fluids, liquid and air, are supplied to the flow path of the nozzle body, and sprayed as cooling water jets juxtaposed between rolls in a secondary cooling zone of a continuous casting apparatus, and casting is continuously drawn by the rolls. The nozzle according to any one of claims 1 to 6, wherein the nozzle is disposed so as to be sprayed with a thick width over the entire surface of the piece.

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